Improvement in drop-hampers



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JAMES MCGEORGE, OF BELLAIRE, OHIO.

IMPROVEMENT lN DROP-HAMMERS.

Specification forming part of Letters Patent No. 140,717., dated uly 8, 1873; application filed v Y October 28, 1872.

To all whom it may concern:

Be it known that I, JAMES McGEoRGE, of Bellaire, in the county of Belmont and State of Ohio, have invented certain new and useful Improvements in Mechanism for Operating Drop-Presses, of which the following is a specification:

This invention relates to that class of machines denominated drop-presses and vertical trip-hammers, which are used in a number of metallurgical operations, as in the forging, stamping, and embossing of metal between dies.

I am aware that V.-shaped male and female friction-wheels have been employed to elevate drop-hammers, and that one of said wheels has been cut away upon its side faces to effect the tripping of the hammer, and I therefore. do not claim theinvention of friction tripping wheels.

My improvements consist of a driven wristpin wheel, connected directly with the hammer, having a iat frictionsurface, tread, or periphery arranged upon the end of a short shaft, and a drivin g-wheel, also having a iiat friction tread, the periphery of the driven wrist-pin wheel being cut away, and a weightved catch being employed to arrest and trip the said wrist-pin wheel without any intermediate gearing, and forming a compact and economical drop-press, in which the weight is dropped directly by the wrist-pin wheel, which raises it, and which takes up' the rebound of the hammer, the distinctive feature of my in-' vention being the usingof the wrist-pin cutaway wheel to effectboth the lifting and dropping of the hammer. My invention also consists in combining with the shaft of either the driven wrist-pin wheel, or the driving-wheel, of a sprin g journal-box, the force of said spring being regulated by set-screws to produce the proper adhesion of the friction-wheels, and to form a yielding bearing for the short shaft; and of a trip-hammer "in'which the wrist-pin lifting and tripping wheel, and the several parts, are constructed and arranged for joint operation, as will be hereinafter more fully described. l'

In the accompanying drawings, Figure 1 represents a front elevation of a lifter for droppresses embracing my invention. Fig. 2 represents a detail view of the adjustable journal box; and Figs. 3 and 4 are detached views, representing the positions of the friction wristpin and drivingwheels when the hammer is in position to descend, and in position for being, elevated.

The frame supporting the operative parts of the machine consists ofthe vertical column or standard A, which, in light machines, may be formed in one piece with the bed or anvil block B, or the same may, if sufficiently light, be secured to the ceiling of the work-shop. The hammer-block or ram O is guided in its movement by the vertical guides D affixed to the anvil B, the sides of which are provided with suitable ways entering grooves in the hammer. A horizontal shaft, E, journaled in boxes a, c secured to the horizontal plate b, which is affixed to the column A, carries, at one end, the friction drive-wheel F, and at its opposite end a pulley, G, for transmitting mo tion to said shaft, from a prime or motive power, through the medium of a belt. Above the shaft E is located a second shaft, H, which is journaled in a stationarybox, I, and removable boX K affixed to the supporting-plate L on the column A. The movable journal-box K is litted on vertical guide-stems or screwbolts c c attached to the plate L, and said stems are provided with spiral springs d d, arranged above or within the boX, for exertinga downward pressure upon the .same toV hold the wrist-pin friction-wheel M on the end of the shaft H in contact with the lower or drive wheel F, and to provide means for regulating the tension of the springs. Nuts e e are applied to the screw-threaded ends of the guide-stems c c, above or below the springs, for accomplishing this result. face of the wheel M is adjustably secured a crank-pin, N, which passes through a slot, O, formed in said wheel, where a clamping-nut, O', is applied for securing the same, and for the purpose of adjusting the same toward or from the periphery of the wheel-for increasing or diminishing the stroke of the hammer connected with said crank-pin by the band I?. I provide a set or temper screw, Q, which passes from the periphery of the wheel M through the shank of the pin into the slot O. The head of the setscrew Q being countersunk in To the side or the periphery of the wheel M, but easily accessible by means of a Wrench for adjusting the same, offers no obstruction to the revolution of the wheel. As represented in Figs. 3 and 4, the periphery of the wrist-pin wheel M is cut away to reduce it from the points It S, for a space less than the semi-diameter, for converting the same, to some extent, into a cam, as it operates in a manner similar thereto. The rotary motion, applied to the shaft E, is transmitted to the Wrist-pin wheel M by the drive friction-wheel F, which may be constructed of Wood to increase the friction, or it may be of metal covered with India rubber, leather, or other material. These wheels are made dat on their periphery, the one M being the usual wrist-pin Wheel, and serving also as the direct means, as the driven wheel, to effect the elevation and tripping of thehammenand to take up its rebound, while the drive-wheel, by its iiat surface, acts directly upon the said Wrist-pin wheel toet fect the complete operation of the hammer, and without gearing or separate Vshaped friction-wheels. Said wheel F, will, when the corresponding surface on the wrist-pin Wheel M is in contact with the same, serve to turn it in a reverse direction, revolving it until the projecting stud T, on theinnerface of said wheel M, comes in contact with the weighted pivoted latch or catch U, when the movement of the wrist-pin wheel M is arrested as the cut-away surface R Sof the same is brought in line with the drive-wheel F, thus removing the frictional contact oi' the two wheels, as shown in Fig. 3. By simply pulling the manipulating cord V attached to the latch U the same is disengaged from the stud'l, when the weight or ram C immediately descends, carrying with it the wristpin wheel M in the direction of the arrow shown in Fig. 3, the wrist-pin wheel immediately resuming contact, as shown in Fig. 4, when the elevating operation ofthe ram is repeated, and the descent of the same accomplished by again withdrawing the catch.

A most decided advantage arising from the use of the friction-wheels, constructed as described, is the avoidance of the stoppage of the motive power when the ram is in an elevated position, as the lower or drive-wheel F will, when the parts are in this position, re-

volve freely, as the frictional contact is broken by the juxtaposition of the cut-away surface of the wrist-pin wheel M with said drivewheel. When the ram is elevated the wristpin N occupies a position slighty to one side of a vertical line in order that the wheel M may be readily turned when tripped, as shown in Fig. 3.

Having described my invention, what I claim is- 1. In a drop-press, the combination of the Wrist-pin wheel M, having a portion of its periphery flattened, as set forth, a drivewheel, F, with plain periphery for communieating motion to said Wrist-pin wheel, and a holding and tripping device operating in connection with said wrist-pin wheel, all substantially as described.

2. In combination with the wrist-pin wheel M, constructed and arranged as described, the stud T, upon the side of said Wrist-pin wheel, and the weighted catch U, arranged as and for the purpose described.

3. In a drop-press in which the Wrist-pin wheel is constructed and arranged to operate as herein described, the combination, with the shaft of said driven wrist-pin wheel M, of the yielding or spring journal-box K, to obtain the advantages herein described.

4:. In a drop-press, the combination of the wristpin Wheel M, constructed as described, the adjusting-screw Q, and the wrist-pin N, With the drive-Wheel F, with plain periphery for communicating motion to said wrist-pin Wheel, and a holding and tripping device operating in connection with said wrist-pin wheel, all substantially as described.

5. The combination in a drop-press of the driven wrist-pin wheel M, constructed and employed for the purpose described, the drive at periphery wheel F, stud T, Weighted catch U, spring journal-box, and hammer O, the several parts being constructed and arranged to operate substantially as herein set forth.

In testimony whereof I have hereunto set my hand this 17 th day of October, A. D. 1872.

JAMES MCGEORGE.

Witnesses:

J. W. N EY, GEORGE CRISWELL. 

